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26 April 2003 <br /> AGE-NC Project No. 95-0254 i <br /> Page 2 of.4 <br /> 2.2: COLLECTION AND ANALYSIS-OF GROUND WATER SAMPLES <br /> i <br /> The depth to ground water was re-measured in each well following evacuation to assure a minimum <br /> of 80%recharge prior to sampling.Water samples were subsequently collected using new disposable. <br /> plastic bailers from wells MW-1 through MW-7:Since MW-7 was bailed dry,it did not achieve 80% , <br /> recharge prior to sampling.The water sample from each well was transferred into three chilled 40-m1 <br /> volatile organic analysis'(VOA) vials containing 0.5 ml 18% hydrochloric acid(HCl) as a sample <br /> preservative and into one 1-liter amber bottle without a sample preservative. <br /> After collection;the samples were labeled and'placed in a'chilled containerfor transportation under. <br /> chain-of-custody to McCainpbell Analytical,Inc.(MAI),'a,California Department of Health Services i <br /> (DHS)-certified analytical laboratory. The ground water samples were analyzed for: <br /> Total petroleum hydrocarbons quaptified as gasoline and as diesel (TPH-g and.TFH-d) in. <br /> accordance with EPA Method 8015-Modified. <br /> Benzene,toluene,ethyll enzene and total xylenes(BTE&X)in accordance with EPA Method <br /> 8021B. <br /> Fuel additives, including, di-isopropyl ether �IPE , ethyl terti ry-but1.ether �TBE <br /> ), <br /> methyl tertiary-butyl ether (MTBE), tertiary-amyl --methyl ether(TAME), tertiary-butyl <br /> alcohol(TBA),.1,2-dibromoethane(EDB)and 1,2-dicholoroetkiane(1,2-DCA)in accordance <br /> ` <br /> .with EPA Method-8260B. <br /> 3:0: FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 12 March-2003.The contarninant impact to groundwater was assessed from the laboratory analytical <br /> r--- data obtained from the sampling event. <br /> 3.1. GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground Water in each well was calculated by subtracting the depth to ground water <br /> 7 . from:the surveyed well casing elevations (Table 1). <br /> The depths to ground water in wells MW-1 through MW-7 were measured between 7.12 feet and <br /> 7.95 feet below the tops of the well casings. Ground water elevations at the site ranged between <br /> 29.03'feet above meari sea level(MSL)in well MW-2B and 30.14 feet above MSL-;in well MW-6. <br /> Groundwater elevations in wells MW- through MW-6 decteased'an average'0.02 feet between the <br /> Advanced GeoEnvironrnental Inc. <br />